diff --git a/field/src/goldilocks_field.rs b/field/src/goldilocks_field.rs
index ef9e2c2b..65315a01 100644
--- a/field/src/goldilocks_field.rs
+++ b/field/src/goldilocks_field.rs
@@ -324,8 +324,8 @@ impl GoldilocksField {
                 }
 
                 z = w * w;
-                b = b * z;
-                x = x * w;
+                b *= z;
+                x *= w;
                 v = k;
             }
             Some(x)